KR102526666B1 - Anti-Static Abrasive Media - Google Patents

Abstract

Disclosed is a polishing body 10 used when polishing a workpiece 20 by a blasting method.
The disclosed abrasive body 10 is composed of a mixture of a polymer 100, an abrasive material 200, a conductive material 300, a high-density material 400, and a coloring additive 500,
The polymer 100 is formed of a thermosetting polymer or a heat-resistant polymer, the abrasive material 200 includes diamond, and the conductive material 300 includes graphene.

Description

Anti-Static Abrasive Media}

The present invention relates to an abrasive used when polishing a workpiece in a blasting method, and is composed of a polymer, an abrasive, and functional additives.

More specifically, an electrically conductive material with a larger surface area per unit volume than polymers and abrasives, while maintaining the same polishing performance by gradually exposing the abrasive to the surface of the abrasive even when the surface of the abrasive is worn, as the abrasive is dispersed inside the polymer. It improves electrical conductivity as well as the bonding strength between the abrasive and the polymer, and at the same time, high-density materials with a higher density per unit volume than the polymer and the abrasive are added to apply large impact energy to the workpiece when the abrasive collides with the workpiece, resulting in polishing ability. It relates to an abrasive body that allows this to be improved.

Abrasives are also used for the purpose of improving fatigue life and hardness by polishing the processing surface of workpieces to improve surface roughness and generating compressive residual stress through physical surface modification (Shot Peening). .

Abrasives used in polishing work are materials with high hardness and are usually formed in the form of spherical or polygonal powder, and are typically diamond, alumina (Al ₂ O ₃ ), silicon carbide (SiC), boron carbide (B ₄ C) , cubic boron nitride (C-BN), titanium boride (TiB ₂ ), cemented carbide, etc. are used. However, depending on the hardness of the workpiece to be polished, nuts, pulp, and cork, which are plants of low hardness, and iron (Fe), copper (Cu), and nickel (Ni), which are metals of medium hardness, ), all metals such as titanium (Ti) and ceramics such as talc, quartz (SiO ₂ ), zirconia (ZrO ₂ ), calcium carbonate (CaCO ₃ ), etc. can usually be used as abrasives. In addition, a mixture of two or more of these types of abrasives may also be used.

The blasting processing method of the present invention includes a dry polishing method of spraying an abrasive body using compressed air, a wet polishing method using a compressed fluid, and a centrifugal (impeller) polishing method using centrifugal force for rotating an impeller or ultrasonic vibration. It includes all blasting processing methods that can adjust the spraying speed, spraying angle, and spraying distance for projecting the abrasive on the processing surface of the workpiece, such as the method.

The blasting method is used to obtain a smooth surface, a mirror surface, a glossy surface, or a lubricated surface by spraying an abrasive and an abrasive containing the same on the surface of a workpiece at high speed to polish the surface of the workpiece, or to remove contaminants attached to the surface. As an example of contaminants, it is used to clean the scale or remove mill scale of cast products, hot forging or hot rolled products, and in the case of mirror polishing, the surface condition of cutting tools is improved, preventing chipping when cutting workpieces. It has excellent properties and is used to improve wear resistance and toughness.

A conventional abrasive was used by attaching an abrasive to the surface of a polymer or resin using water or an abrasive liquid. In this method, when the abrasive collides with the workpiece for a long time, the abrasive attached to the polymer surface is easily detached and worn away, leaving only the polymer.

That is, since the abrasive of the conventional abrasive body easily loses its abrasive ability after being used for a predetermined period of time, it is inconvenient to attach the abrasive to the polymer surface again.

In addition, the polishing body is sprayed at high speed and collides with the surface of the workpiece to physically generate frictional heat and frictional electricity during the polishing process, causing many problems. In the case of polymers, a deterioration reaction is promoted by frictional heat, and a large amount of dust is generated because they are easily worn. Most of these deterioration reactions are caused by an oxidation reaction by oxygen, that is, a radical chain reaction called autoxidation. sticking to it, causing problems that lower work efficiency.

These problems are caused by conventionally used abrasives, that is, polymer and ceramic abrasives, which are non-conductive, so that conventional abrasives without conductive materials have no electrical conductivity during the polishing process, so that charges cannot flow and remain stationary. This is because static electricity is induced. In particular, in the case of Korea, in winter when the relative humidity is low, static electricity is easily generated by friction, and when it collides with static electricity dust generated from grinding work, it is very likely to spread to a large fire due to an explosion. This is a problem that is directly related to not only property damage but also the lives of workers, so a plan to prevent it is absolutely necessary.

On the other hand, in order to perform precise surface treatment using a blasting method, a very small abrasive and an abrasive body including the abrasive should be used. However, the smaller the size of the abrasive particles, the smaller the weight, so it is difficult to obtain sufficient impact energy to perform polishing.

Therefore, development of an abrasive that can maintain the abrasive ability even when used for a long time, suppress the generation of static electricity that causes a fire, and provide sufficient impact energy even when the abrasive is small, and an abrasive that includes the abrasive. desperately needed

Korean Patent Publication No. 10-2006-0041220

The present invention has been proposed to solve the above problems, and an object of the present invention is to maintain the same polishing function by gradually exposing the abrasives dispersed inside the polymer even if the surface of the abrasive body is worn.

In addition, an object of the present invention is to improve the electrical conductivity as well as the bonding strength between the abrasive and the polymer by adding an electrically conductive material having a larger surface area per unit volume than the polymer and the abrasive.

Another object of the present invention is to add a high-density material having a higher density per unit volume than a polymer and an abrasive so that sufficient impact energy can be applied to a workpiece even when the size of the abrasive particle is small.

The present invention relates to an abrasive used when polishing a workpiece by a blasting method, and is composed of a mixture of a polymer and an abrasive,

The polymer is characterized in that it is formed of a thermosetting or heat-resistant polymer.

The present invention is characterized in that the polymer is composed of at least one of epoxy, urethane, silicone, phenol, and polyurea.

The abrasive of the present invention,

It is characterized in that it is contained in a dispersed arrangement inside the polymer.

The abrasive of the present invention is characterized by containing diamond.

The abrasive of the present invention is characterized by containing at least one of SiC, B ₄ C, Al ₂ O ₃ , Cr ₂ O ₃ , CeO ₂ , SiO ₂ , CaCO ₃ , and Talc (talc).

The abrasive of the present invention is characterized in that it is composed of 10 to 90% (vol.%) of the total volume of the abrasive body.

The size of the abrasive of the present invention is characterized in that 0.1 ~ 100um.

In the present invention, an electrically conductive material is added to impart electrical conductivity to the polishing body.

The electrically conductive material is composed of a material having a larger surface area per unit volume than the polymer and the abrasive, thereby improving electrical conductivity and bonding strength between the abrasive and the polymer.

The present invention is characterized in that the electrically conductive material includes at least one of graphene, carbon nanotube (CNT), graphite, and activated carbon.

The present invention is characterized in that the electrically conductive material is composed of 0.1 to 10% (vol.%) of the total volume of the abrasive body.

In the present invention, a high-density material is added to impart kinetic energy to the abrasive,

The high-density material is composed of a material having a higher density per unit volume than the polymer and the abrasive, and when the abrasive collides with the workpiece, a large impact energy is applied to the workpiece to improve polishing ability.

The high-density material of the present invention is characterized in that it is formed of tungsten carbide (15.63g/cm³).

The high-density material of the present invention is characterized in that it is composed of 0.1 to 10% ratio (vol.%) based on the total volume of the polishing body.

In the present invention, a coloring material 500 for easily distinguishing products is added to the abrasive body 10,

The coloring additive 500 is composed of a dye or pigment material, and is characterized in that it is easily distinguished according to color for each abrasive product.

The colorant additive of the present invention is characterized in that it includes at least one of iron oxide, titanium oxide, azo dye, indigo dye, sulfide dye, inorganic pigment, and organic pigment.

The colorant additive of the present invention is characterized in that it is composed of 0.1 to 1% ratio (vol.%) based on the total volume of the polishing body.

Even if the abrasive is dispersed and disposed inside the polymer according to the present invention, even if the surface of the abrasive body is worn, the dispersed abrasive is gradually exposed to maintain the same abrasive function.

In addition, the present invention has an effect of improving the electrical conductivity as well as the bonding strength between the abrasive and the polymer by adding an electrically conductive material having a larger surface area per unit volume than the polymer and the abrasive.

In addition, the present invention has an effect of allowing sufficient impact energy to be applied to a workpiece even when the abrasive particle size is small by adding a high-density material having a higher density per unit volume than a polymer and an abrasive.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a view showing that an abrasive polishes the surface of a workpiece through a blasting method.
2 is a cross-sectional view schematically showing the structure of an abrasive having improved electrical conductivity according to the present invention.
3 is a view for explaining and comparing the distribution of the abrasive in the conventional abrasive body and the abrasive body according to the present invention.

Hereinafter, various embodiments of this document will be described with reference to the accompanying drawings. However, this is not intended to limit the technology described in this document to a specific embodiment, and it should be understood that it includes various modifications, equivalents, and / or alternatives of the embodiments of this document. In connection with the description of the drawings, like reference numerals may be used for like elements.

In addition, expressions such as “first,” “second,” etc. used in this document may modify various components regardless of order and/or importance, and to distinguish one component from another. It is used only and does not limit the corresponding components. For example, 'first part' and 'second part' may indicate different parts regardless of order or importance. For example, without departing from the scope of rights described in this document, a first element may be called a second element, and similarly, the second element may also be renamed to the first element.

In addition, terms used in this document are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related art, and unless explicitly defined in this document, an ideal or excessively formal meaning. not be interpreted as In some cases, even terms defined in this document cannot be interpreted to exclude the embodiments of this document.

The present invention relates to an abrasive body 10 used when polishing a workpiece 20 in a blasting method.

1 is a view showing that the polishing body 10 polishes the surface of a workpiece 20 through a blasting method.

In the blasting method, the polishing body 10 is sprayed on the surface of the workpiece 20 at high speed to polish the surface of the workpiece 20 or remove contaminants attached to the surface.

2 is a cross-sectional view schematically showing the structure of an abrasive body 10 having improved electrical conductivity according to the present invention.

The shape of the polishing body 10 is implemented in various ways according to the manufacturing process of the polishing body 10 .

The abrasive body 10 shown in FIG. 2 is shown in a spherical shape for convenience of description, but is not necessarily limited thereto.

The abrasive body 10 according to the present invention is composed of a mixture of the polymer 100 and the abrasive material 200.

The polymer 100 is composed of at least one of epoxy, urethane, silicone, phenol, and polyurea.

As the polymer 100, a thermosetting polymer or a heat-resistant polymer is used.

The polymer 100 has a predetermined elasticity in terms of material characteristics. When the abrasive body 10 made of the polymer 100 collides with the workpiece 20, it absorbs the shock due to the elasticity of the polymer, so that no trace of impact is left on the surface of the workpiece 20.

In addition, the polymer 100 prevents deterioration due to frictional heat during polishing due to its heat resistance.

The abrasive 200 is preferably composed of a mixture of one or more of SiC, B ₄ C, Al ₂ O ₃ , Cr ₂ O ₃ , CeO ₂ , SiO ₂ , CaCO ₃ , and talc, as well as diamond.

Diamond is the hardest among minerals and is widely used in abrasives and cutting tools.

The size of the abrasive 200 according to the present invention is 0.1um to 1mm, and is composed of 10 to 90% (vol.%) relative to the total volume of the abrasive body 10.

3 is a view for explaining and comparing the distribution of the abrasive in the conventional abrasive body and the abrasive body according to the present invention.

A conventional abrasive was used by attaching the abrasive 200 to the surface of the polymer 100.

In the conventional case, while the abrasive body 10 repeatedly collides with the workpiece 20, the abrasive material 200 attached to the surface of the polymer 100 is worn away, leaving only the polymer 100.

That is, the conventional abrasive body has a problem in that the abrasive 200 is worn out after a predetermined period of time and easily loses the abrasive ability. Therefore, an additional process of disposing of the abrasive or attaching the abrasive 200 to the polymer 100 again for reuse was required.

Accordingly, in the abrasive body 10 according to the present invention, the conventional problem is solved by dispersing and disposing the abrasive material 200 inside the polymer 100.

3(a) schematically shows a cross-sectional view of a conventional polishing body, and FIG. 3(b) schematically shows a cross-sectional view of an abrasive body 10 according to the present invention.

The abrasive body 10 according to the present invention is configured by irregularly dispersing the abrasive material 200 inside the polymer 100.

Even if the abrasive 200 is worn as the abrasive 200 collides with the workpiece 20, polishing is performed by another abrasive 200 dispersed inside.

That is, even if the surface of the abrasive body 10 is worn, the dispersed abrasives 200 are gradually exposed to maintain the same polishing function as at the beginning.

On the other hand, the abrasive body 10 is sprayed at high speed through the blasting method to collide with the surface of the workpiece 20 to generate a tremendous amount of dust and static electricity in the course of polishing.

The commonly used abrasive body 10 is an insulator with low electrical conductivity.

Since the electrical conductivity is low, the charge cannot flow and stays in a stationary state, and static electricity is generated.

If static electricity generated in this process meets dust, it is highly likely to spread into a large fire.

Accordingly, the present invention solves the conventional problems by adding an electrically conductive material 300 to impart electrical conductivity to the abrasive body 10 .

The electrically conductive material 300 according to the present invention is composed of a material with a larger surface area per unit volume than the polymer 100 and the abrasive 200.

Since the electrically conductive material 300 according to the present invention has a large surface area per unit volume, current can flow smoothly, and the contact area between the polymer 100 and the abrasive 200 is large, thereby improving bonding strength.

By using a large specific surface area between the polymer 100 and the abrasive 200 to form a strong bond between the polymer 100 and the abrasive 200, the durability of the abrasive 10 is improved.

The electrically conductive material 300 is preferably composed of a mixture of one or more of graphene, carbon nanotubes (CNT), graphite, and activated carbon.

Graphene is a material with a two-dimensional structure in which carbon atoms gather to form a two-dimensional plane, has very high electrical conductivity and high thermal conductivity, and has a very large specific surface area.

Graphene conducts electricity more than 100 times better than copper, can move electrons more than 100 times faster than single crystal silicon, which is mainly used as a semiconductor, has more than 200 times more strength than steel, and has excellent elasticity, so it can be stretched or bent. also does not lose its electrical properties.

Generation of static electricity can be prevented by adding a material having excellent electrical conductivity, such as graphene, to the abrasive body 10 .

A carbon nanotube (CNT) is carbon with a nanostructure in a cylindrical shape.

In the case of carbon nanotubes (CNTs), electrons are not scattered and are well transmitted in the longitudinal direction due to such structural characteristics.

Preferably, the surface area per unit volume can be maximized by using a mixture of cylindrical carbon nanotubes (CNTs) and graphene.

Graphene is mixed between the carbon nanotubes (CNT) of the cylindrical bonding structure to maximize the specific surface area, and the bond strength between the polymer 100 and the abrasive 200 is improved with the maximized specific surface area .

Although electrical conductivity can be imparted using metal, metal occupies a large volume, so it is impossible to manufacture it in the size of an abrasive body usable in the field.

The polishing body according to the present invention is polished with a uniform dispersion state through a high-speed dispersion device after mixing graphene and carbon nanotubes (CNT) with a small specific gravity and a large surface area (30 to 900 m ² /g). made of sieve

The polishing body according to the present invention has an electrical resistance of 10 ³ to 10 ⁹ Ω It is maintained within the range and exhibits performance as a conductive abrasive.

On the other hand, in order to perform fine surface treatment using the blasting method, a fine abrasive body 10 must be used.

In this case, the finer the size of the particles constituting the polishing body 10, the smaller the weight, making it difficult to obtain sufficient impact energy to perform polishing.

Accordingly, the present invention solves the conventional problems by adding the high-density material 400 to impart kinetic energy to the abrasive body 10.

The high-density material 400 is composed of a material having a higher density per unit volume than the polymer 100 and the abrasive 200 .

The high-density material 400 is composed of 0.1 to 10% (vol.%) of the total volume of the abrasive body 10.

The high-density material 400 is preferably formed of tungsten carbide.

Tungsten carbide (density: 19.25 g/cm ³ ) is hard and has a high kinetic energy as a material with high density per unit volume.

By adding the high-density material 400 to the polymer 100, which is lighter in weight than the abrasive 200, the density of the abrasive 10 increases and has greater kinetic energy.

The blasting method performs a polishing process using the collision energy of the polishing body 10 .

Therefore, in a process in which the abrasive body 10 composed of the high-density material 400 collides with the workpiece 20, kinetic energy is converted into impact energy.

That is, when the polishing body 10 to which the high-density material 400 is added collides with the workpiece 20, a large impact energy is applied to the workpiece 20, thereby improving the polishing ability.

When an abrasive manufacturing process operator or user handles many types of similar products, accidents such as product differentiation mistakes due to carelessness can easily occur if the product is of the same color.

Therefore, if both the manufacturing operator and the user can easily distinguish various products, handling and work convenience can be greatly increased.

That is, by adding the colorant 500, the conventional problems are solved by changing the color for each abrasive product, that is, the type of polymer, the type of abrasive, and various functions.

The present invention relates to an abrasive used when polishing a workpiece by a blasting method, and more particularly, the abrasive is dispersed inside a polymer and even if the abrasive is worn, the abrasive dispersed is gradually exposed to the surface of the abrasive. While maintaining the same polishing function, by adding an electrically conductive material with a larger surface area per unit volume than polymers and abrasives, not only electrical conductivity but also the bonding strength between abrasives and polymers is improved, and at the same time, high density per unit volume is higher than polymers and abrasives. It relates to an abrasive body in which a material is added to apply large impact energy to a workpiece when the abrasive collides with the workpiece to improve polishing ability.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and is common in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible by those with knowledge of, and these modified embodiments should not be individually understood from the technical spirit or perspective of the present invention.

10: abrasive
20: Workpiece
100: polymer
200: abrasive
300: electrically conductive material
400: high-density material
500: coloring additive

Claims (17)

It relates to an abrasive body 10 used when polishing a workpiece 20 by a blasting method,
It is composed of a mixture of polymer 100 and abrasive 200,
An electrically conductive material 300 for imparting electrical conductivity to the abrasive body 10; is added,
The electrically conductive material 300 is composed of a material having a larger surface area per unit volume than the polymer 100 and the abrasive 200, thereby improving electrical conductivity and bonding strength between the abrasive 200 and the polymer 100. and
The electrically conductive material 300 is characterized by using a mixture of carbon nanotubes (CNT) and graphene, an abrasive body
According to claim 1,
The polymer 100 is an abrasive body, characterized in that composed of at least one of epoxy, urethane, silicone, phenol, and polyurea.
According to claim 1,
The abrasive 200,
Characterized in that it is dispersed and included in the polymer 100, the abrasive body
According to claim 1,
The abrasive material 200 is characterized in that the diamond is included, the abrasive body According to claim 3,
The abrasive 200 is characterized in that at least one of SiC, B ₄ C, Al ₂ O ₃ , Cr ₂ O ₃ , CeO ₂ , SiO ₂ , CaCO ₃ , talc (Talc) is included, the abrasive body
According to claim 1,
The abrasive material 200 is characterized in that composed of 10 to 90% ratio (vol.%) relative to the total volume of the abrasive body 10, the abrasive body
According to claim 1,
Characterized in that the size of the abrasive 200 is 0.1 ~ 100um, the abrasive body
delete delete According to claim 1,
The electrically conductive material 300 is composed of 0.1 to 10% (vol.%) of the total volume of the abrasive body 10, characterized in that the abrasive body
According to claim 1,
A high-density material 400 for imparting kinetic energy to the abrasive body 10; is added,
The high-density material 400 is composed of a material having a higher density per unit volume than the polymer 100 and the abrasive 200, so that when the abrasive body 10 collides with the workpiece 20, the workpiece 20 has a great impact. Characterized in that the polishing ability is improved by applying energy, the polishing body
According to claim 11,
The high-density material 400 is characterized in that formed of tungsten carbide (Tungsten Carbide), the abrasive body
According to claim 12,
The high-density material 400 is characterized in that composed of 0.1 to 10% ratio (vol.%) relative to the total volume of the abrasive body 10, the abrasive body
According to claim 1,
A coloring additive 500 for easily distinguishing products is added to the abrasive body 10,
The coloring additive 500 is composed of a dye or pigment material, characterized in that it is easily distinguished according to the color of each abrasive product, the abrasive body
According to claim 14,
The coloring additive 500 comprises at least one of iron oxide, titanium oxide, azo dye, indigo dye, sulfide dye, inorganic pigment, and organic pigment.
According to claim 14,
The coloring additive 500 is characterized in that composed of 0.1 to 1% ratio (vol.%) relative to the total volume of the abrasive body 10, the abrasive body
According to claim 1,
Characterized in that the size of the polishing body is 0.3 ~ 3mm, the polishing body

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